北京朝阳广场深基坑支护技术

Bracing of Deep Foundation Pit Applied in Chaoyang Square Construction Project

北京朝阳广场深基坑支护设计尝试采用上部复合土钉墙,下部桩加预应力锚杆的支护形式。上部复合土钉墙较桩锚支护节约成本。土钉墙设计中第三道土钉替换为预应力土钉,有效地限制了土钉墙顶部位移。土钉墙顶面及桩顶连梁上布置变形监测点,采用量距法及经纬仪挑直线的测量方法进行变形监测,实测变形的数据均在规范允许范围内。

The article introduces the application of bracing of deep foundation pit in Chaoyang Square. The compound soil nailed wall and pre-stressed anchor rod was adopted for the upside and underside wall separately. Soil nailed wall was economical. And in the design, the third layer of soil nail wall was replaced with pre-stressed soil nail to effectively restrict the displacement of the top of soil nailed wall. Monitoring spot was laid on the top of soil nailed wall and the top of pile to measure distortion with theodolite, and all the data measured is in permitted scope of criterion.